Did the drop work for you? Did you try it?
If you fork the page to a site you own it you should find your copy works too. The drop combines information from two sources, the page that you forked and the asset that you didn’t. The transporter.html will be retrieved from my site but the address through which it transports comes from the surrounding page items.
Try substituting an image transporter of your own design. Edit the url in the Code plugin. Does this work? Try reverting to an unedited version and drop on the ghost page. Does it work?
Did your image transporter work? What went wrong?
The Assets plugin on your forked page should show both my and your assets folders as configured with markup. You can fork my html script with the buttons provided. Or you can download my script to your own computer and then upload the same or modified file to your assets. I keep copies of html scripts on my laptop and in GitHub too. With three copies I have to be careful to not misplace changes.
Try downloading my script and modifying it to show the drop zone in pink. This will be a css change in the style section.
Have you tried to update your copy of transporter.html? Can you send me a link?
Try setting a break point in the drop handler and single step what it does.
drop api & variations
eval the code
add a form
open multiple windows